Lever for lifting-jacks.



PATENTED MAR. 17, 1908.

G. R. BOOTH.

LEVER P0P. LIPTING JAGKS.

APPLICATION FILED OCT. 23. 1907.

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ATTORNEYS W/TNESSES UNITED sTATEs PATENT oEEIoE.

GLEN RUSSELL BOOTH, OF GHANA, ILLINOIS.

LEVER FOR LIFTING-J'ACKS.

Application :filed October 23, 1907.

To all whom itmay concern:

Be it known that I, GLEN RUSSELL BOOTH, a citizen of the United States,and a resident of Ohana, in the county of Ogle and State of Illinois,have invented a new and Improved Lever for Lifting-Jacks, of which thefollowing is'a full, clear, and exact description.

This invention relates to lifting jacks, embodying a slotted standard, ablock for supporting a load and carried by said standard, a rack on thestandard, and an actuating lever engaging the standard for elevating ordepressing it; and more particularly the improvement is designed toafford novel details of construction for an operating lever, that isespecially well adapted for coperation with the lifting jack of myinvention,

for which a patent was allowed August 30, 1907.

The invention consists in the novel construction and combination ofparts, as is hereinafter described and defined in the appended claims.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a side view of a lifting jack, and of the improved leverpartly in section and applied thereon Fig. 2 is a side view of the jackand lever but showing the lever deressed and locked in loweredadjustment 5 ig. 3 is a longitudinal sectional view of the im rovedlever seen in direction of the arrow in ig. l; Fig. 4 is an enlargedtransverse sectional view, substantially on the line 4--4 in Fig. 2; andFig. 5 is an enlarged transverse sectional view, substantially on theline 5-5 in Fig. 2.

The lifting jack shown for illustrating the coperative action of thelever which embodies the present invention, comprises essentially thefollowing details: Upon a preferabl hat base plate A, is erected ahollow stan ard B, that is formed of two side walls spaced apart andheld separated by the base and transverse bolts a, thus affording avertical slot in the front and also the rear of the standard. Slidablein the rear slot of the standard B, is a lifting bar C, that ischanneled in its opposite sides, as at b, and on the front edge of thelifting bar a toothed rack c is formed. A lifting block D, is mountedupon the lifting bar O, and is made adjustable thereon by its engagementwith a shoulder e on said bar, and a ratchet toothed rack Specificationof Letters Patent.

Patented March 17', 1908.

Serial No. 398,721.

f on the rear face thereof, and for a vertical adjustment of the liftingbar the improved lever is provided, comprising the following details: Inthis example of my invention, the lever is formed in two parts orsections 10, 1l, one slidable in the other in the order named- Thesection 10 is preferably formed of solid metal and may with advantage becast in a mold. At one end the lever section 10 is provided with atoothed segment 10, `that is adapted for meshing engagement with therack c on the lifting bar C, as will be hereinafter more fullyexplained. The lateral walls of the lever section 10 are flattened andparallel with each other, thus giving said section equal thicknessthroughout the` length thereof; and as shown in Figs. 4 and 5, the upperand lower sides thereof are similarly convexed to afford a neat 'finishand rendery the same convenient for liandling. A longitudinal groove gis formed in the normally upper side of the lever section 10, and achannel h in one side thereof extended intermediately of the ends, thefunction of said groove and channel appearing in the further specificdescription of the device.

The lever section 11 is hollow, and receives the said section 10, that'fits neatly but slidably therein, and as shown, the lateral walls ofthe lever section l1 are parallel with each other, the remaining wallsthereof being convexed to remove sharp corners and render this sectionof the lever convenient for handling.

The lever section 11, at or near the end thereof which receives theother section 10, is thickened as at i, and in said portion a threadedperforation is formed for the reception of a set screw t. 4

The bottom of the groove gin the lever section l0 is preferably concavedor converged, as shown, and the point of the screw t is slightly reducedin diameter below the thread of the screw and' rounded on the extremity,so that upon an embedment of the screw, the point thereof will bear uponthe bottom of the groove. This arrangement obviates the possibility ofthe end of the screw marring the top convex surface of the lever portion10, as would be the case should the point of the screw be allowed tobear directly upon said surface.A l Thus by having the screw embeddedwithin the groove g, the top convex surface of the lever portion l0always remains smooth, and insures a perfect fit Within the hollowing ofthe lever portion 11,

and the thread of the screw will be preserved from injury.

Near the open end of the lever section 11, in one side wall thereof, akeeper pin m, is inserted through a perforation and secured therein,said pin being disposed opposite the channel h in the lever section 10and entering it.

Preferably the bottom of the channel 72. is concaved, as shown in Figs.4 and 5, and the pin m may have contact with said bottom, the free endof the pin being rounded to conform therewith.

It will be seen that the channel h is of such length that the section 11 of the lever may be drawn out a considerable distance, and when soextended, the pin m will bear upon the bottom of the channel h andrender the con- Ilection between the two sections of the lever firm, sothat they will coact as one piece for the operation of the lifting jack;furthermore, the section 11 of the lever will be held from displacementwhen extended. The channel h while shown as being less in depth at oneend, may be obviously modified, and made of even depth its entirelength, as the set screw i can be slightly tightened, which will producea firm effect, regardless of the different extended positions of thelever portion 11.

A segmental gear 10a is pivoted at its radial center between the sidewalls of the standard B, by means of a cross bolt n, that is secured inthe segmental gear, and loosely engages opposite arcuate slots in thestandard walls, as appears at n', for one side wall thereof, in Figs. 1and 2.

By means of the pivotal engagement just described, the two-part leverwhen it is contracted in length may be rocked on the pivot 'ndownwardly, so that the closed and normally outer end o of the leversection 11 will be adapted for contact with the base plate A.

In the closed end 0 of the lever section 11, which is preferablyconvexed, a transverse notch 0 is formed, having V-shape, and preferablysaid notch is lined with an elastic cushion 02 formed of rubber fabric,or other available material.

Upon the base plate A, at a suitable point, an angular rib o3 is formedor secured, that is the counterpart of the notch o', and upon loweringthe telescoped sections of the lever sufficiently, the rib may beinserted in the notch, and thus secure the lever from rattling, thesections of the lever being secured together so as to prevent improperloo'seness, by an .adjustment of the set screw fL, The angular rib o3 ispreferably covered with a rubber fabric or other material, which mayserve as a cushion thereon, as shown in Fig. l. As shown in Fig. 3, aprojection r is formed on the end wall of the lever section 11, tofacilitate the formation of the notch o', and said projection, beingslotted and disposed at pressed, and prevents said lever from having anyside motion while interlocked with the rib 03. The base A 1s recessed at04, see Fig. 1, to receive the section 11, the members of the projection1' spanning the base A at that point, which further prevents side motionof the twoart lever.

It wil be obvious that the lever, in contracted condition, wheninterlocked with the rib 03, will be held from rattling or displacementwhen the jack is moved from place to place.

To further obviate rattling of the lever, it is preferred to placeopposite rubber cushions p on the walls of the standard where thetelescoped lever passes between said walls when folded downwardly, saidcushions that appear sectionally in Fig. 5, by their enforced engagementwith the convexed side of the lever section ll, serving to hold thelever from moving, and also enforce the locked engagement of the rib o3within the cushioned notch 0.

Having fully described my invention, I claim as new and desire to secureby Letters Patent:

1. The combination with a lifting jack, of a lever formed in twosections, one section being solid and the other section hollow butclosed at one end, said end having a notch therein.

- 2. The combination with a lifting jack, of a lever formed in twosections, one section that engages the'jack being solid, and the othersection hollow but closed at one end, said end having an angular notchtherein, and an elastic lining in said notch.

3. The combination with a lifting jack, of a lever formed in twosections, one solid the other hollow, the solid section having alongitudinal channel in one side that is converged in its bottom, andthe other or hollow section a keeper pin that engages the channel and isshaped on its end to conform therewith, the pin by its contact with thechannel preventing rattling between the lever sections.

4. A telescoping lever formed in two sections, one section solid and theother section hollow, the 4hollow section having an end wall, parallelside walls, and transversely curved upper and lower walls, the othersection conforming in contour to that of the hollow sections internalsurface and wherein it slides, the solid lever section having alongitudinal channel in one side, and the other section an insertiblekeeper pin that projects into the channel and contacts with its bottomAto prevent rattling between the lever sections.

5. The combination with a lifting jack having a base and a verticallyslotted standard, of an eXtensible lever pivoted by one end upon saidstandard and adapted for downward folding movement, and means forlocking the depressed end of the lever upon the base of the jack.

6. The combination with a lifting jack having a base, and a slottedstandard, of a sectional telescoping lever pivoted near one end between.the side walls of the standard and adapted for downward foldingmovement, the lever having a notch in an end wall thereof, and the basea corresponding rib that will enter the notch when the lever is foldedand longitudinally adjusted between its sections.

7. The combination with a lifting jack having a base and a slottedstandard, of a telescoping two-part lever, one end thereof being pivotedbetween the side walls of the standard, the lever being adapted fordownward folding movement when the parts thereof are slid together, onesection of the lever having an end wall and a transverse angular notchtherein, an elastic lining cushion in said notch, guard walls on the endwall leading to the notch, and on either side thereof, and a rib on thebase that enters the notch when the lever is downwardly folded.

8. The combination with a lifting jack having a base and a slottedstandard, of a two-part telescoping lever pivoted near one end betweenthe walls of the standard, so as to traverse the slot, one end of thelever being closed, said end wall having a transverse V-shaped notchtherein, and an elastic lining in said notch, the base having an angularrib thereon that lits within the cushioned notch when the lever isfolded downwardly and longitudinally adjusted, said rib having-anelastic cover.

9. The combination with a lifting jack, of a lever formed in twosections, one slidable in the other, the section that engages the jackhaving a longitudinal groove therein, the other section being perforatedopposite the groove and threaded therein, and a set screw engaging theperforation and seating in the groove.

10. The combination with a lifting jack, of a lever formed in twosections, one slidable in the other, the section that engages the jackhaving a longitudinal groove therein that is converged in its bottom,the other section which receives the grooved one hav ing a threadedperforation therein opposite said groove, and a set screw having areduced and converged end portion that may seat in the groove.

In testimony whereof I have signed .my name to this specification in thepresence of two subscribing witnesses.

GLEN RUSSELL BOOTH.

Witnesses:

G. E. WEST, V. M. BOOTH.

